247 Eukrate

Eukrate (minor planet designation: 247 Eukrate) is a rather large main-belt asteroid. It is dark and probably a primitive carbonaceous body. The asteroid was discovered by Robert Luther on March 14, 1885, in Düsseldorf. It was named after Eucrate, a Nereid in Greek mythology.

247 Eukrate
Discovery
Discovered byRobert Luther
Discovery date14 March 1885
Designations
(247) Eukrate
Pronunciation/juːˈkreɪtiː/[1]
A901 TB, 1947 TA,
1960 TC
Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc131.09 yr (47880 d)
Aphelion3.4086 AU (509.92 Gm)
Perihelion2.0778 AU (310.83 Gm)
2.7432 AU (410.38 Gm)
Eccentricity0.24257
4.54 yr (1659.5 d)
18.0 km/s
75.9892°
0° 13m 0.948s / day
Inclination24.991°
0.16410°
54.969°
Physical characteristics
Dimensions134.43±2.5 km
12.093 h (0.5039 d)
0.0595±0.002
CP
8.04

    In 2001, the asteroid was detected by radar from the Arecibo Observatory at a distance of 1.18 AU. The resulting data yielded an effective diameter of 134 ± 15 km.[3]

    An Occult (Software) plot of 5 Occultation chords (and a miss) with DAMIT Inversion model at event time.

    There have been 9 occultation observations of this asteroid since 2004.[4] The latest of 2018 May 12 was a 5 chord observation that allows, using Occult (Software), the scaling of the DAMIT model 1207, to yield a Mean volume-equivalent diameter of 137.5km and a Mean surface-equivalent diameter of 140.0 km.

    References
    1. A rare case of a long alpha in Greek, eukrātē, so the stress is on the 'a'. Cf. "eucratic". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
    2. "247 Eukrate". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
    3. Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999 2003" (PDF), Icarus, 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018, retrieved 14 April 2015.
    4. "PDS Asteroid/Dust Subnode". sbn.psi.edu. Archived from the original on 25 April 2018. Retrieved 19 May 2018.


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